Abstract: Dehydroabietylamiue and its acetate are new optical resolving agents with the advantages of low cost, less toxicity and high efficency. They are prepared from disproportionated rosin through amination, hydrogenation, salt formation and alkaliuation.Their physical constants and IR spectra conform to those given in the literature. Their resolving power for dl-2-(6-methoxy-2-naphthyl) propionic acid, an intermediate of a new medicine "Naproxen", has been proved satisfactory.